Following is the original quote from r4igold official :
" The chips included in this 3DS cart is MX23J4GC0-75H(48Pin) and 25L4001(8Pin) and its hardware structure is almost the same as that of the NDS cart.What's more,Our technical team removed the standing out part of the 3DS cart and inserted it into a NDS,so 3DS cart's encrypiton part is different from that of a NDSL cart."
From above,we will find that there havn't much change for r4igold 3DS with r4igold.The only mini difference between them lies in package and modchip adopted,please look at following comparison picture :


you will find compared to r4igold original package,the new package for r4igold 3DS with a striking mark "3DS" in the left bottom,yet,they are still sharing with the same offical website.(www.r4ids.cn)
In the respect of Modchip Adopted : the r4igold 3DS uses MX23J4GC0-75H(48Pin) and 25L4001(8Pin) Modchip,so 3DS cart's encrypiton part is different from that of a NDSL cart.Yet,its hardware structure is almost the same as that of the NDS cart.
R4igold 3DS Video Show :
There will be more information about this item and i will keep update in this forum.
Source Link :
R4igold 3DS Official
R4igold 3DS Flashcard